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A slightly different problem.

I also had two matches 15 minutes apart the other day, but luckily the second match was an easy Cup match, no worries, and I managed to pick my team for the Cup as well. You could have 4 minutes to sort your team out; 8 minutes for the first match, that 4 minute window, and then the 3 minutes where you cannot change anything, though sometimes you're not given control of your squad back until a little later.